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제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Nano-scale surface study and reaction mechanism: Interaction between U(VI) and nZVI

2012년 2월 16일 14시 56분 29초
ENVR.P-1335 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 25일 (수요일) 18:00~21:00
저자 및
신영호, 이우진
KAIST 건설 및 환경공학과, Korea
Uranium (U) usually exists as soluble U(VI) and insoluble U(IV) in the nature. Oxidation-reduction processes can significantly affect the mobility, transport, and fate of U. Iron(Fe(II)/Fe(III)) plays an important role in the determination of uranium oxidation state in the subsurface. Recently it was reported that Fe(II) on ZVI surface can reduce U(VI) into U(IV) as reactive reductant. Furthermore ZVI, among other iron sources in nature, has received much attention in study of reductively degradation of chlorinated compounds and reduction of heavy-metal. Since ZVI has been used major material in soil/ground water remediation technology(e.g., PRB) and has been used as base material of canister for storage of radioactive wastes, it is important to understand interaction mechanism between ZVI and U(VI) for the successful remediation of radioactively contaminted sites and managing radioactive waste safely. In this study, nano-sized ZVI(nZVI) was reacted with aqueous U(VI) under anaerobic condition. The U(VI) fate in aqueous phase was monitored by laser-spectroscopy and surface reaction on nZVI was analyzed by x-ray spectroscopy to verify nano-scaled interaction mechanism. As a result of quantification of aqueous Fe(II)/Fe(III) concentration with reaction time, U(VI) accelerated Fe(II) dissolution from nZVI surface indicating U(VI) can be removed from aqueous phase by cation exchange with Fe(II) on nZVI surface.